In late summer 2015, Sweden embarked on one of the largest self-described humanitarian efforts in its history, opening its borders to 163,000 asylum seekers fleeing the war in Syria. Six months later this massive effort was over. On January 4, 2016, Sweden closed its border with Denmark. This closure makes a startling reversal of Sweden's open borders to refugees and contravenes free movement in the Schengen Area, a founding principle of the European...